Using the PDFViewer with the latest version of PDF.js (3.9.179) throws js exceptions. Version 3.4.120 is the last one, with which no js exception is thrown.
Dojo example: https://dojo.telerik.com/IHedIhur/3
The file is loaded, however, js exceptions are thrown:
--scale-factor CSS-variable must be set, to the same value as
viewport.scale, either on the
container-element itself or higher up in the DOM. text_layer.js:480:14
No js exceptions when using PDF.js versions newer than v3.4.120.